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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '202c6e1a5b895f791a0547196c84b661119f3a5461495e9c81939b8eccc05d97' 
  AND token = 'kYmpbmfkaLN3J9ot4Ju9nwgK2Qw9QQN6lxH/O+Cga1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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