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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eea3f6f9ec5aa38cc83c1d77846eac4da0c2d53a794991de6a61ecd515206c44' 
  AND token = 'xkQBvCgM9a8OpX61K0XhLn2KS0Z1Vod6SDPdnItHBR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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