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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02ed086b929ee3fa0dd0439d00971fb1257267e5fba6f42dda2e5340da06c619' 
  AND token = 'IuZy8ANr5SZEjPcC2m5DcGAj4LX11/X+SX6q6prYSMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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