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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cbde28de85afc48d3df15610d0ca814be90beb3f09f9b90cae5e3abbb3ced39' 
  AND token = 'uD7C98/iEJm3urfYCsoUwrQ+rOFnvGrUQGRU3UgxV/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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