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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4b1c6f763700a568b4998fcbe425557b7c1ea31c0a0e52c2ca85bd2cd361d52' 
  AND token = 'an+S31dSmHPDvMqJ7NlE8WWUwGud5EyFgCYHrNEHa3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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