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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf35cc2f79cc95b51b0f703b0cc4d529acc28180a801173a2fecd197db7560a3' 
  AND token = '3HEaz4cwY3smP9OHsqtcVKodhiY3CsPposxaKIjsm6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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