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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '766d570fa9351ec305d97df93679fa603546514ad5378d0cbc95f872d6d2e419' 
  AND token = 'w4KugPYd4D02rXiswR8wyotulsr+8I+wO20M9AA6i/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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