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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43e19859de8f7f81c7a3f9938088fbe1424c0e256db020da4cf8f04a84ac3518' 
  AND token = '7jBuR+/w7Vr4ORob91VtQ2j/uigFqTNjKAK/u1uSof4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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