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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7854a9848d7d88176f9fa928049b30291b028a44ab5fa1168bbe9287a68843b5' 
  AND token = 'LSfNPca6KuxFr4fa4s2nErZkuOqS1N12dH6s3ORYj3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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