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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b946ec262995196967cd531f1cf4d57f3f52e5f94bc7d1a229b976360027b2de' 
  AND token = 'yFaNBSgXSwD3usdlkKQEp7zHWEtCWqlApStzq4Ak73s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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