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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e94fcf2c086d7a68d7da5d0d0ee5e6e93d3082b542aa03c3da5962156f7e7680' 
  AND token = 'Mdp0+fjWXF7dYir+YMBffIXIAhqzi9qoUIhgP6L15RY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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