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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36293c117af864e68a4802609048cf8a7810a7f347bfcf90b7dadd78bd2b2f88' 
  AND token = 'Pt5jVEsag7uC0Q6JTIZbPbeZRMlgUyNliMO+xuHjUt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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