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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1e7309868c82cf4236224abc9738aabafdd3f2ed99ac0f454f2fbc78037b3a2' 
  AND token = 'G8di7hr8nHjXbHP00xkycWIUl36WrVSyiPTqBATFsQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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