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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5e22610f14fc29d936c722995ea4de273379f8b2488b4f3b41a1b718d1dd237' 
  AND token = 'QZBNAzJEuAwfEHQn4Fg4rRoHQHXT4+871INUfkNKdgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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