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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97b34bfb8be2f0e4068a1d10070d4377bb625ec602a1b119a1a908900b0295b5' 
  AND token = '9HMRzM5UL88hwlPoweQgjV7Mjjp9b/XIyYm4oBy4YbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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