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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9988f37d440b2f1c22e0e0d4ec86e411153ad3c87eac8650b195bc231094d01e' 
  AND token = 'Cs6OFOVhFFW839ReB5KZFaS3isctGtQxAjDQ6vkaLO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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