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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f01e25360f72a70f0b265401bcb52ca996912206892206ff7e064f96c89652b5' 
  AND token = 'l1wGPr4UvqrbTWtH/j0j5Rz36sYSCarhigdCBazNpk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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