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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5ca0fae18cbffaba6b237be0d071bb70d641f8378e3240b98eac02ca1baca01' 
  AND token = '3acglWeLD3XNH5LEoWw8dDlvRwhXP6ZUq5vMJhReuK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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