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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6fcf415ffea4099db63fe1e206a08823dc5b386a27b709b7613efcbf58bd67d' 
  AND token = 'F8wxXm1fPwdNoeOEG5uUsJo7MSoiOR1nOceLS0KLKxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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