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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e7a1f7e651509d645d4a57f7dfa808a1163d3f70b56949bca0ce0bf2b280523' 
  AND token = 'woQkyB4/agfpmJGiGVUnvKrHo3evDXwee9ClceVxIT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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