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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '132eeb88ed97f5dddd74076f311bef3f8345cf381d1b4a23cc655e45348f900d' 
  AND token = 'McKeX0v5M06H3Kbx8aovM+anm+Kf8qNumqP+EpaYp90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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