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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0da0d1891ad69bb097f671f9ca1a5126a9a78c0f23340ff8df53d772a2bbb4e2' 
  AND token = 'eYCLe4Y98r+iIszhOVfDcE3eoUzQGODpAOrVClyRY7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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