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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '542fa1718cdbceb2485b57feb7931a50769bd916b4b29086c10ddaa047c9d326' 
  AND token = 'oJlA0J8/GH/opLtlRa3yyYimKN1FNX1sfhJPYiuMPlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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