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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4adf123694a42d0093e5abf555264d41037b20d28b40bee08045581de221cf6c' 
  AND token = 'Avgg48dLav+zaM9Y1/EzXZ6tEfIh4dbeHkwuIJRBZ1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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