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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfeb8a147b9dc835a749297acc5738d938aa9572402bf038f0072b5f220b1e75' 
  AND token = 'gnYWo2NF/JbOo117ehHqey/aZrBXFU8VgXh6Zir2s1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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