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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f176fa00998c7e213f64eb73d08345c045ccaec4082680aa189e8b07c6063a7e' 
  AND token = 'OVGrczdF5BzveHNvMEXL4e/zbjlo9e67igknZ7AcGp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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