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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd75b24fd4cf004b0971de994fb49175fa39abeeb05fd613ce6438433781b89fc' 
  AND token = 'yZQQ9l3otomiDrnX58QBGt0V8bOwxRgh8zOc2N5LKPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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