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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95e4b8867fcf0f46cf9a2bd99cf6f2a0b0c0b2a0a3498c79251ae4d6abd68973' 
  AND token = 'Y41cGHRxx35MJfo4RBG5xC7Pb3pSY/MBMLEWV+wlnak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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