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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f47fb9d4103deab770effc7e85d2402203a8ef7dd5b4372a7677ffaa6600ba2' 
  AND token = 'abXQ7jfMXlUAFghADwpVbTZb9idTBB+11SmzTi+Iy50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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