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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea71d30aea71142cb62668c0e6dcca8ffe7c27e387ef8f1db16cf4a6ebd15305' 
  AND token = 'Y1wpSWZC4U2Y5Y+bq34laywF+XIQqucejaQ+aNA9xZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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