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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecc920a6ce3b80d0821bff3175872a5147fc66378307f6b0fb8b4fbd782b7cb0' 
  AND token = '3NHG9nbvWoBNndgQibfQ1jz80YuHaToxR2niPgVcsiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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