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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '143152edc76f3fc7e49f3a17eb9104edc250f450cfa3b2fba02df80c8a20773c' 
  AND token = 'GA439iVDOEZPYa8JNmGfKitf0I2c8IHvT55ygWrbv/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

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