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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64d3a783e58d191dcbcdc64f56a83bfd933e7e80b2a67a9fdc4f50112f053330' 
  AND token = '0GCY8suRmivm8a4z2krOQpzHBPJ3x+5byjoJ6SpCzrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}