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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c26b552610267c18fc3088fe299dc0099d4ffd5ef7e12c998b1e0c8d367cd529' 
  AND token = 'urXrZxoxwtfLoF6ofos3YHxKMeBSmr9ooEAzjj/fWwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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