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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b28c40cb3a2dae372ee1ed2241e745333d15d4d107c5e6a609e8c6ab321ab5f' 
  AND token = 'Ke5y2JbGX3rBUp1S9Y9en19RNmxXD1l1hUKNbsDrzGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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