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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b779d5508a337eb63c2e50ddba78d4a92b1fde72576bfd4365bdd1c354475d4f' 
  AND token = '35aX0sOya0a0+ErrJF93FXqXAc336+/IhcqBKWOIAkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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