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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a811238f4cfd60f1a235c6ea0e2da42fe8507dba8cf9fe7f0b290b50fd9d6d60' 
  AND token = '//mtvWmdlwDe9Irk4PEnmbLQa/Q4t84GrMGYr9UMnao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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