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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fe62e56c9ad9ab0f538f628efb6b19dddb2a9cd8b9df14c2d645021e4ecc57e' 
  AND token = 'NS+tr4zk/EWa221odbaUQmq9+EObgPf790c1nD45uCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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