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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb4e6d4cce3a75ee79367fd46cdf2d713a6ca33a44565f29418a5ebda95fc4a8' 
  AND token = '4jKGN2FSUGMXBVYb2m88FWTz0G5CEqdnW4Uu0vWtUR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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