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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11e7594b71a863bed9cd9326aaf2481321041b3b275974a784e1d993638cdc6b' 
  AND token = 'Bv/s2/7l0L9BI6lZ1Rk6e3ANz+Z6ju1qOWTvMfZuGWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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