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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d76566728699ecb40fe93f1c00e63b1cc3f2f9c30a73d317e91acbf7c00e3eb' 
  AND token = 'SSiIlyyq6Tf9By03JTuWEPh4O4YQKizmMcihoJxtN68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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