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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc305cba956a01d1fff682cbdc0dbd9da473485625e6a29882e59a09db7476c4' 
  AND token = 'Hihn0zVQpLP23Vxvd+EJEnyCVMAIZQDI9ppdDsM0e34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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