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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a969906e1f564e5ef69dc51e5ae2ffdb8439f29b75fa0c55cf073d63e2e4e8b5' 
  AND token = '1BIHMpmyLAb7jGe7jIAUBXCrp6UMDij9XAQp1NsbQss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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