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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80c30611529cf6623a7a876f3b6ce84b3e2f0d94ec48310cb6690526222b9c91' 
  AND token = 'gf069vjn6AknOJd7Hdf4m8KMp2Bok4x8IA9+P60ZylI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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