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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11ac1a7c1d99689d6c358b796dfca3d71abb31113fe753e75766c378a9b0c89a' 
  AND token = 'afC1cZ2byP3+OecEkUg5DQYMDWXsHp/ROPwGFiBV/O8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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